3J Collets
When installed into a 3J collet chuck or holder, these collets securely grip round workpieces. They provide a stronger hold on small workpieces than a standard lathe chuck. All have external threads.
| Collet Size | TIR (Total Indicated Runout) Accuracy | Workpiece Dia. Tolerance | Body Dia. | Overall Lg. | External Thread Size  | Material | Each | |
Round | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/8" | 0.0008" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 000000 |
| 1/2" | 0.0011" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 5/8" | 0.0011" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 3/4" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 7/8" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 1" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 1 1/8" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 1 1/4" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
| 1 1/2" | 0.0015" | -0.004" to 0" | 2" | 3 3/4" | 1.988"-20 | Steel | 00000000 | 00000 |
Machine-Your-Own 3J Collets
When installed into a 3J collet chuck or holder, these collets can securely grip workpieces. Also known as emergency collets, their machinable face allows you to bore an opening to exactly the size and shape you need. All have external threads.
| Max. Bore Dia. | Body Dia. | Overall Lg. | Face Pilot Hole Dia. | External Thread Size | Material | Each | |
| 1 3/4" | 2" | 3 3/4" | 1/16" | 1.988"-20 | Hardened Steel | 00000000 | 0000000 |
Collet Fixtures
Pair these fixtures with collets to tightly grip workpieces for machining. You can mount them on milling machines, drill presses, and other work surfaces. However, they’re not for use with lathes, grinders, or high-speed rotary tables. All have a through hole to accommodate long workpieces.
Square-drive fixtures are designed for precise, repeatable workholding with consistent clamping force. They keep the collet stationary while their sleeve clamps. Made of steel, these fixtures are stronger and more wear resistant than cast iron fixtures, and they can hold up to higher clamping forces. They’re precision machined for accuracy. Use the included socket wrench to clamp and unclamp your workpiece or use a calibrated torque wrench to fine-tune the clamping force.
Mounting Holes | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Collet Type | For Max. Workpiece Dia. | Through Hole Dia. | Dia. | Ht. | Material | No. of | Dia. | Bolt Circle Dia. | Mounting Orientation | Power Source | Includes | Each | |
| 3J | 1 3/4" | 1 15/16" | 5" | 4" | Black-Oxide Steel | 6 | 3/8" | 4 1/8" | Horizontal, Vertical | Manual | Socket Wrench | 0000000 | 000000000 |